MAX16818EVKIT+【PDF 1/25 页】KIT EVALUATION FOR MAX16818

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Sheet目录989

[1页]2页 3页 4页 5页

19-0666; Rev 2; 3/09

ATION

EVALU

AVAIL

KIT

ABLE

1.5MHz, 30A High-Efficiency, LED Driver

with Rapid LED Current Pulsing

General Description

The MAX16818 pulse-width modulation (PWM) LED dri-

ver controller provides high-output-current capability in

a compact package with a minimum number of external

components. The MAX16818 is suitable for use in syn-

chronous and nonsynchronous step-down (buck)

topologies, as well as in boost, buck-boost, SEPIC, and

Cuk LED drivers. The MAX16818 is the first LED driver

controller that enables Maxim’s technology for fast LED

current transients of up to 20A/μs and 30kHz dimming

frequency.

This device utilizes average-current-mode control that

enables optimal use of MOSFETs with optimal charge

and on-resistance characteristics. This results in the

minimized need for external heatsinking even when

delivering up to 30A of LED current. True differential

sensing enables accurate control of the LED current. A

wide dimming range is easily implemented to accom-

modate an external PWM signal. An internal regulator

enables operation over a wide input voltage range:

4.75V to 5.5V or 7V to 28V and above with a simple

external biasing device. The wide switching frequency

Features

? High-Current LED Driver Controller IC, Up to 30A

Output Current

? Average-Current-Mode Control

? True-Differential Remote-Sense Input

? 4.75V to 5.5V or 7V to 28V Input Voltage Range

? Programmable Switching Frequency or External

Synchronization from 125kHz to 1.5MHz

? Clock Output for 180° Out-of-Phase Operation

? Integrated 4A Gate Drivers

? Output Overvoltage and Hiccup Mode

Overcurrent Protection

? Thermal Shutdown

? Thermally Enhanced 28-Pin Thin QFN Package

? -40°C to +125°C Operating Temperature Range

Ordering Information

range, up to 1.5MHz, allows for the use of small induc-

tors and capacitors.

PART

MAX16818ATI+

TEMP RANGE

-40°C to +125°C

PIN-PACKAGE

28 TQFN-EP*

The MAX16818 features a clock output with 180° phase

delay to control a second out-of-phase LED driver to

reduce input and output filter capacitors size or to mini-

mize ripple currents. The MAX16818 offers programma-

ble hiccup, overvoltage, and overtemperature protection.

The MAX16818ETI+ is rated for the extended tempera-

ture range (-40°C to +85°C) and the MAX16818ATI+ is

rated for the automotive temperature range (-40°C to

+125°C). This LED driver controller is available in a

lead-free, 0.8mm high, 5mm x 5mm 28-pin TQFN pack-

age with exposed paddle.

MAX16818ETI+ -40°C to +85°C 28 TQFN-EP*

+Denotes a lead(Pb)-free/RoHS-compliant package.

*EP = Exposed pad.

Simplified Diagram

7V TO 28V

Applications

Front Projectors/Rear Projection TVs

ILIM

V LED

Portable and Pocket Projectors

Automotive, Bus/Truck Exterior Lighting

LCD TVs and Display Backlight

MAX16818

Automotive Emergency Lighting and Signage

Pin Configuration appears at end of data sheet.

OVI

CLP

CSP

PGND

HIGH-FREQUENCY

PULSE TRAIN

NOTE: MAXIM TOPOLOGY

________________________________________________________________ Maxim Integrated Products

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

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